uboot-imx

MLK-20758 mx7: Add new command for tamper pin

Add new u-boot command "imx_tamper" to configure and check the tamper pins.
The codes are used for reference and test. So command is disabled at default,
user can enable it by adding CONFIG_IMX_TAMPER=y to defconfig

The iMX7D has 10 tamper pins those can be used for SNVS tamper detection.

Tamper 9 pin is NVCC_DRAM power switch for LPSR by default.
It must be fused to tamper function by command
=> fuse prog -y 1 3 0x80000000
Otherwise, SNVS power consumption would be high

When tamper is detected, CPU can't enter/stay in SNVS mode,
the tamper must be cleared and disabled before enter SNVS.

Signed-off-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Shaojun Wang <shaojun.wang@nxp.com>
Acked-by: Peng Fan <peng.fan@nxp.com>
(cherry picked from commit d520e1c6067c08103a020b0bc19feb620473e543)